Language：English   Publishing type：Research paper (scientific journal)  

We investigated the time-course pattern of electrolyte leakage from the root flesh of growing tuberous roots of two sweetpotato cultivars, Koganesengan and Narutokintoki, after exposing them to high temperature for short duration. For both cultivars, the electrolyte leakage after 1 h of treatment was significantly higher than that at 24 h after treatment. This pattern was similar to the pattern observed following instantaneous flooding treatment previously reported by us. Electrolyte leakage from plant cells is an indicator of cellular responses to various stress factors. Similar stress, therefore, might be caused in heated and flooded tuberous roots.

DOI： http://doi.org/10.2525/ecb.54.183

Repository Public URL： http://hdl.handle.net/2324/4774205

Language：English   Publishing type：Research paper (scientific journal)  

Compared to sub-irrigated sweetpotatoes (Ipomoea batatas (L.) Lam.), periodic surface-irrigated plants, i.e., twice a week on root media, showed increased α-tocopherol content in their tuberous roots with no apparent changes in both of tuberous root development and oxygen concentration around the roots. We speculated that surface irrigation might temporarily cover the tuberous root surface with water and inhibit oxygen movement into the roots, thereby increasing the antioxidant α-tocopherol content, for coping with the slight oxidative stress occurring within the roots. Therefore, we performed 1-3 times instantaneous flooding, with different intervals, which perfectly covered the whole root surface with water, of sweetpotato plants grown in a phytotron glass room (25℃, 70%RH). Electrolyte leakage from the tuberous root flesh cells showed a temporal increase for the flooding treatment, while it immediately recovered within 24 h. Instantaneous flooding did not affect the storage root development in any of the experiments. Apparent increases in the α-tocopherol content were observed during the 3-time flooding at 3-day intervals. Our results suggest that more frequent root surface wetting is necessary for increasing the α-tocopherol content, which is released because of the oxidative stress that occurs within the roots.

Repository Public URL： http://hdl.handle.net/2324/4774204

Language：English   Publishing type：Research paper (international conference proceedings)  

Many crude drugs used in Kampo medicines in Japan represent untapped medicinal resources. Domestication of the wild plants from which these drugs are derived and preservation of their natural habitats are necessary for establishing a stable supply of Kampo medicines. Here, we investigated the influence of the moisture condition of root medium on the growth of Pinellia ternata Breit. by using a sub-irrigation solid substrate culture system. The moisture condition was controlled by maintaining a constant ground water level (GWL). Plants were grown for 15 weeks under a GWL of either 4 cm (GWL-4) or 8 cm (GWL-8) below the corm base in a phytotron glass room at 25°C and 70% relative humidity. The water content of the root media around the corm in GWL-4 was only 1% higher than that in GWL-8. However, water content apparently affected corm enlargement and the development of new bulbils. Relative yield of the corm per plant, compared with the initial weight, was ~400% in GWL-4 and ~200% in GWL-8. The number of bulbils produced in a plant was 13.5 in GWL-4 and 4.4 in GWL-8. The effective ingredient, a kind of water-soluble polysaccharide consisting mainly of arabinose, was about 10% higher in GWL-8 corms than in GWL-4 corms. Moreover, when comparing the two conditions, the relative difference in corm yield was remarkably larger than that observed for the effective ingredient content. Overall, productivity was considered to be higher in GWL-4 than in GWL-8.

Repository Public URL： http://hdl.handle.net/2324/4785228

Language：English   Publishing type：Research paper (scientific journal)  

Tuberous root growth and antioxidant contents of 2 sweetpotato (Ipomoea batatas (L.) Lam.) cultivars were examined using 2 different irrigation schemes: surface-irrigation and sub-irrigation. Coarse silica sand was used for root media, which maintained well the gas permeability and water drainage around the roots. The root surface was periodically wetted for watering in the surface-irrigated roots, while the sub-irrigated roots were not. The irrigation methods did not affect the oxygen concentration around the roots. No differences in plant growth were observed between the 2 irrigation methods. However, the content of α-tocopherol in the tuberous root was significantly higher in the ordinary-irrigated roots for both of two cultivars. Thus, the periodical wetting increased the α-tocopherol content in the tuberous root of sweetpotato cultivars without any apparent changes in tuberous root development.

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Eguchi, T. Suzuki, H. Miyamoto, M. Hamakoga, S. Yoshida, J. Chikushi and M. Kitano. Influence of Ground Water Level on Carrot Growth in Solid Substrate Culture System. Journal of Science and High Technology in Agriculture (J. SHITA) 21(2): 65-71.

Language：English   Publishing type：Research paper (scientific journal)  

Other Link： http://www.plantroot.org/TOC2008-1.htm

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Eguchi, S. Moriyama, I. Miyajima, S. Yoshida and J. Chikushi A Hydroponic Method Suitable for Tops Production of a Sweetpotato Cultivar 'Suioh'. Journal of Science and High Technology in Agriculture (J. SHITA) 19(4): 167-174.

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Eguchi, M. Kitano, S Yoshida and J. Chikushi, Root temperature effects on tuberous root growth of sweetpotato (Ipomoea batatas Lam.) -Direct and indirect effects of temperature-, Environment Control in Biology 41(1):43-49, 2003.

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Araki, M. Kitano, K. Okano, S. Yoshida and T. Eguchi, Environmental effects on dynamics of fruit growth and photoassimilate translocation in tomato plants (3) -Effect of salt stress-, Environment Control in Biology 39(1):53-58, 2001.

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1093/jexbot/51.346.961

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Eguchi, M. Kitano and H. Eguchi, Growth of tuberous root as affected by the ambient humidity in sweetpotato (Ipomoea batatas Lam.), Environment Control in Biology 37(3):197-201, 1999.

Language：Japanese   Publishing type：Research paper (scientific journal)  

T. Eguchi, M. Kitano and H. Eguchi, Water relations and dynamics of tuber growth rate in sweet potato plants (Ipomoea batatas Lam.), Environment Control in Biology 36(2):91-95, 1998.

Publisher：HortScience  

Fruit size and sugar content are key determinants of fruit quality, influenced by environmental factors and agronomic practices and sink strength provided by the genetic potential. Strawberry (Fragaria ×ananassa) produces fruits arranged in inflorescences, whose growth is affected by carbon competition between them. The competitive ability is termed as sink strength, which can be quantified as the potential growth rate under sufficient resource supply and/or no carbon competition among sinks, referred to as non-limiting conditions. Most previous studies did not observe potential growth, thereby failing to adequately evaluate sink strength and to assess the influence of environmental factors and agronomic practices on fruit growth. This study aimed to investigate the potential growth of strawberry fruits and analyze its sink strength dynamics. Non-limiting conditions were established by removing flowers to one fruit per inflorescence in a greenhouse experiment with plants grown in soil and given water and nutrients through drip irrigation. Fruits were harvested every 5 days from 5 to 55 days after anthesis (DAA), measuring the size, weight, and concentrations of major soluble carbohydrates in strawberry (sucrose, glucose, and fructose) and starch. Sink strength was represented by absolute growth rate based on fruit weight, and its components, sink size and sink activity, were represented by weight and relative growth rate, respectively. Fruit volume and weight showed a gradual linear increase at 5 DAA and then rapidly increased, following a single sigmoid curve between 30 and 55 DAA. Fruits primarily accumulated glucose and fructose during early growth, shifting to sucrose after 35 DAA. Starch concentration peaked at 5 DAA and then exponentially decreased. Sink strength exhibited a single peak between 40 DAA and 45 DAA. Sink strength gradually increased with sink size until 30 DAA, whereas sink activity significantly decreased until 30 DAA. Thereafter, sink strength and sink activity exhibited a peak, whereas sink size continued to increase. These results suggest that the major determinant of sink strength was sink size during early fruit growth, shifting to sink activity during late growth.

DOI： 10.21273/HORTSCI18013-24

Web of Science

Scopus

Publisher：Plant Growth Regulation  

The carbon allocation in source leaves between sucrose and starch is an important mechanism that affects plant productivity. We previously found that strawberry plants accumulate starch in response to excess carbon supply from photosynthesis compared with translocation and sucrose storage capacity in source leaves. However, because these data were acquired from three separate cultivation seasons in field conditions, seasonal impacts could not be ruled out. Therefore, herein, we aimed to investigate the role of starch in carbon allocation in strawberry leaves and to explore whether the relationship between sucrose and starch reported in our previous study is an inherent characteristic that is independent of seasonal variations. To prevent seasonal influences, carbohydrate dynamics in strawberry leaves were studied under controlled environmental conditions with high (High) and low (Low) photosynthetic activity. During the day, both sucrose and starch concentrations increased in the High treatment, but starch concentration increased only marginally in the Low treatment. Furthermore, starch production was enhanced in the High treatment when sucrose concentration exceeded 150 mmol C m− 2. Consistent with previous findings, the current findings indicated that photosynthetically fixed carbon is initially allocated to sucrose; however, when photosynthetic activity increases and leaf sucrose concentration exceeds its storage capacity, the excess carbon is then allocated to starch. This study provides strong evidence that, regardless of season, starch serves as an overflow product with sucrose storage capacity as a threshold during carbon allocation in strawberry leaves.

DOI： 10.1007/s10725-023-01042-9

Web of Science

Scopus

Language：English   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

<p>　We compared the sugar, dry matter, and effective ingredient levels of the dried corms of the medicinal plant <i>Pinellia ternata</i> Breit. obtained by two drying methods: natural and freeze drying. The sucrose, glucose, and fructose levels were significantly higher in the naturally dried corm than those in the freeze-dried corm. Dry matter content was also significantly higher in naturally dried corm than in freeze-dried corm. There was no significant difference between the levels of the effective ingredients in the corms obtained using the different drying methods. The two drying methods, natural and freeze drying, affected the sugar content of <i>P. ternata</i> corm.</p>

DOI： 10.2525/ecb.61.55

Scopus

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

The carbon allocation in source leaves between sucrose and starch is an important mechanism that affects plant productiv-
ity. We previously found that strawberry plants accumulate starch in response to excess carbon supply from photosynthesis
compared with translocation and sucrose storage capacity in source leaves. However, because these data were acquired
from three separate cultivation seasons in field conditions, seasonal impacts could not be ruled out. Therefore, herein, we
aimed to investigate the role of starch in carbon allocation in strawberry leaves and to explore whether the relationship
between sucrose and starch reported in our previous study is an inherent characteristic that is independent of seasonal
variations. To prevent seasonal influences, carbohydrate dynamics in strawberry leaves were studied under controlled
environmental conditions with high (High) and low (Low) photosynthetic activity. During the day, both sucrose and starch
concentrations increased in the High treatment, but starch concentration increased only marginally in the Low treatment.
Furthermore, starch production was enhanced in the High treatment when sucrose concentration exceeded 150 mmol C
m−2. Consistent with previous findings, the current findings indicated that photosynthetically fixed carbon is initially allo-
cated to sucrose; however, when photosynthetic activity increases and leaf sucrose concentration exceeds its storage capac-
ity, the excess carbon is then allocated to starch. This study provides strong evidence that, regardless of season, starch
serves as an overflow product with sucrose storage capacity as a threshold during carbon allocation in strawberry leaves.

DOI： https://doi.org/10.1007/s10725-023-01042-9

Language：English   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

<p>　To obtain the typical growth pattern of the medicinal plant <i>Pinellia ternata</i> Breit., we investigated the growth of plants grown under constantly controlled environments (air temperature: 25℃, air humidity: 70%RH, day length: 12 h, light intensity: 220 μmol photon m^-2 s^-1 [PPFD]). The growth pattern was comparable with other plant growth patterns grown under different environmental conditions. Leaf number, leaf area, and corm weight of the plants increased over time, while dry matter content in the corm maintained at approximately 35% during cultivation. Cormlets born on the corm increased linearly during cultivation, and the weight increased significantly after 11 weeks of cultivation. The content of araban, the effective ingredient of the corm, increased linearly until 11 weeks of cultivation, after which, the content appeared to level off. Thus, we obtained the typical growth pattern of the <i>P. ternata</i>, which is useful for evaluating the environmental effects on the plant productivity.</p>

DOI： 10.2525/ecb.60.191

Scopus

CiNii Research

Language：English   Publisher：Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

<p> Medicinal plants (<i>Pinellia ternata</i> Breit.) were cultivated under four nutrient solution conditions, namely a pH of 4 and electrical conductivity (EC) of 2.2 mS cm^-1, pH of 4 and EC of 1.2 mS cm^-1, pH of 6 and EC of 2.2 mS cm^-1, and pH of 6 and EC of 1.2 mS cm^-1. Plants were grown for 15 weeks in phytotron glass rooms controlled at an air temperature of 25℃ and a relative humidity of 70%. The leaf number per plant was measured every week, the leaf chlorophyll content (SPAD) was measured at 100 d after planting, and the corm yield and the effective ingredient, namely araban, content in the corm were evaluated after 15 weeks of cultivation. No clear effects of the nutrient solution EC and pH on the corm growth, the corm quality, and leaf chlorophyll content were not observed in this experiment. The EC and pH of the nutrient solution will not affect the productivity of the P. <i>ternate</i> in the ranges of EC 1.2–2.2 mS cm^-1 and pH 4–6, respectively.</p>

DOI： 10.2525/ecb.60.149

Scopus

CiNii Research

Publisher：Environmental and Experimental Botany  

Carbon export from leaves as translocation is a result of plant coordination of leaf carbohydrate availability. Carbohydrate availability coordination is actively studied in model plants (Arabidopsis) under regulated conditions and can be optimized to increase productivity. However, in horticultural crops grown under field conditions, carbon export dynamics and coordination are poorly understood. The objective of this study was to analyze the dynamics of carbon export from leaves and the effects of carbohydrate availability coordination on these dynamics in strawberry grown under field conditions. Through three different day/night cycles, we measured leaf carbohydrate concentrations and photosynthetic rates and evaluated the dynamics of carbon export based on the leaf carbon balance. During the daytime, when carbon resources are almost entirely supplied by photosynthesis, strawberry leaves stored sucrose and starch. Starch synthesis was remarkable when sucrose concentration exceeded 150 mmol m−2, and the carbon export rate tended to increase. In the nighttime, when carbon resources are supplied by leaf sucrose and starch stored during the daytime, the starch concentrations decreased linearly and the carbon export rate was lower than the daytime level. These results indicate that in the daytime, the coordination of leaf carbohydrate availability for starch storage and carbon export was affected by leaf sucrose concentration, whereas, at night, it was regulated by leaf carbon storage levels at dusk rather than sucrose concentration. Thus, this study elucidates the basis of carbon export dynamics in strawberry leaves under field conditions, advancing our understanding of the role of leaf carbohydrates in translocation.

DOI： 10.1016/j.envexpbot.2022.104806

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

Carbon export from leaves as translocation is a result of plant coordination of leaf carbohydrate availability. Carbohydrate availability coordination is actively studied in model plants (Arabidopsis) under regulated condi- tions and can be optimized to increase productivity. However, in horticultural crops grown under field condi- tions, carbon export dynamics and coordination are poorly understood. The objective of this study was to analyze the dynamics of carbon export from leaves and the effects of carbohydrate availability coordination on these dynamics in strawberry grown under field conditions. Through three different day/night cycles, we measured leaf carbohydrate concentrations and photosynthetic rates and evaluated the dynamics of carbon export based on the leaf carbon balance. During the daytime, when carbon resources are almost entirely supplied by photosyn- thesis, strawberry leaves stored sucrose and starch. Starch synthesis was remarkable when sucrose concentration exceeded 150 mmol m− 2, and the carbon export rate tended to increase. In the nighttime, when carbon resources are supplied by leaf sucrose and starch stored during the daytime, the starch concentrations decreased linearly and the carbon export rate was lower than the daytime level. These results indicate that in the daytime, the coordination of leaf carbohydrate availability for starch storage and carbon export was affected by leaf sucrose concentration, whereas, at night, it was regulated by leaf carbon storage levels at dusk rather than sucrose concentration. Thus, this study elucidates the basis of carbon export dynamics in strawberry leaves under field conditions, advancing our understanding of the role of leaf carbohydrates in translocation.

DOI： https://doi.org/10.1016/j.envexpbot.2022.104806

Language：English   Publishing type：Research paper (scientific journal)  

This study builds an easy and quick method of analysing the active ingredients in bio–fertilizers to ensure the uniformity of materials in bio–fertilizers that are made using ingredients that are cruder herbal materials or remnants after the primary medicinal crops are used as herbal materials. An ELISA was cre- ated using MAb, and it can substitute for HPLC in the analysis of saikosaponin a (SSa), ginsenoside (G– Rb1) and ginsenoside (G–Rg1), which are active ingredients of ginseng, and the ELISA can be used for var- ious ginseng plants grown as typical medicinal crops. The concentration measurement ranges of G–Rb1, G–Rg1, and SSa are 12.5~250 ng/mL, 0.5~12.5 μg/mL, and 0.26~1.5 μg/mL, respectively.

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

A cropped soil column system was used to analyze water and ion dynamics in soil affected by root absorptive
functions of different crop species. The respective soil columns were cropped with corn, sunflowers, beets, and frog-fruits
(i.e. cover grass), where the salinized groundwater was supplied as found in the salinized crop fields under desertification.
In the corn and sunflower columns, the increased transpiration of leaves and decreased Na+ and Cl- absorbing power of
roots resulted in increased salt accumulation in the soil, while the major essential ions of NO3-, PO43- and K+ were actively
absorbed by roots and scarcely remained in the soil. In the beet and frog-fruit columns, it was considered that transpiration
was low compared with the corn and sunflower columns and also soil surface evaporation was depressed by leaves growing
horizontally over the soil surface. Furthermore, beet roots showed uniquely high Na+ and Cl- absorbing power. These
factors resulted in decreased salt accumulation in the soil of the beet and frog-fruit columns. The lowest salt accumulation
occurred in the no-crop column (without leaf transpiration and root absorptive functions). These results demonstrated that
the transpiration, active and selective ion absorption, and leaf morphology of different plant species have a large influence
on the amount and composition of ions accumulated in the soil.

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Ito, Y., Miyamoto, H., Yasunaga, E., Eguchi, T. and Chikushi, J. Application of ECH2O probes to the environmental control field in biology. Journal of the Japanese Society of Soil Physics　No. 114:33-36.

Language：Japanese   Publishing type：Research paper (scientific journal)  

H. Miyamoto, S. Yoshida, J. Chikushi， T. Eguchi and Y. Ito. Estimation of Moisture Conditions in Organic and Inorganic Growing Media Based on Hydraulic Properties. Journal of Science and High Technology in Agriculture (J. SHITA) 21(2): 72-78.

Language：Japanese   Publishing type：Research paper (scientific journal)  

H. Miyamoto, H. Cho, Y. Ito, J. Chikushi and T. Eguchi. General Calibration of Capacitance Soil Moisture Sensor for Various Electrical Conductivity Conditions. Journal of Science and High Technology in Agriculture (J. SHITA) 21(2): 86-91.

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：南九州大学都城キャンパス（都城市）   Country：Japan  

Divergence of polyploidy in the medicinal plant Pinellia ternata distributed in Japan
Kosuke INOUE1，Yukio OZAKI2，Yuki MIZUNOE2，Hiroyuki TANAKA3，Satoshi YOSHIDA4，Ken MATSUOKA4，Toshihiko EGUCHI4
1School of Agriculture，Kyushu Univ．，2 Faculty of Agriculture，Kyushu Univ．， 3Pharmaceutical Sciences, Kyushu Univ．，4 Biotron Application Center, Kyushu Univ.

The medical plant Pinellia ternata which were gathered from all over Japan were researched the ratio of fluorescence intensity, pollen diameter and germination rate of pollen. It was found that there is a divergence of polyploidy. However, no correlation was suggested among the ratio of fluorescence intensity, pollen diameter, and germination rate of pollen.

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学農学部（樽味キャンパス）   Country：Japan  

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学農学部（樽味キャンパス）   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢工業大学野々市キャンパス（石川県）   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：シーガイアコンベンションセンター（宮崎県）   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：シーガイアコンベンションセンター（宮崎県）   Country：Japan  

Event date： 2014.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto University   Country：Japan  

Many crude drugs used in Kampo medicines in Japan represent untapped medicinal resources. Domestication of the wild plants from which these drugs are derived and preservation of their natural habitats are necessary for establishing a stable supply of Kampo medicines. Here, we investigated the influence of the moisture condition of root medium on the growth of Pinellia ternata Breit. by using a sub-irrigation solid substrate culture system. The moisture condition was controlled by maintaining a constant ground water level (GWL). Plants were grown for 15 weeks under a GWL of either 4 cm (GWL-4) or 8 cm (GWL-8) below the corm base in a phytotron glass room at 25°C and 70% relative humidity. The water content of the root media around the corm in GWL-4 was only 1% higher than that in GWL-8. However, water content apparently affected corm enlargement and the development of new bulbils. Relative yield of the corm per plant, compared with the initial weight, was ~400% in GWL-4 and ~200% in GWL-8. The number of bulbils produced in a plant was 13.5 in GWL-4 and 4.4 in GWL-8. The effective ingredient, a kind of water-soluble polysaccharide consisting mainly of arabinose, was about 10% higher in GWL-8 corms than in GWL-4 corms. Moreover, when comparing the two conditions, the relative difference in corm yield was remarkably larger than that observed for the effective ingredient content. Overall, productivity was considered to be higher in GWL-4 than in GWL-8.

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：明治大学駿河台キャンパス（東京都）   Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：香川大学幸町キャンパス（高松市）   Country：Japan  

Event date： 2012.9

Presentation type：Oral presentation (general)  

Venue：東京大学農学部弥生キャンパス（東京都）   Country：Japan  

Event date： 2011.9

Presentation type：Oral presentation (general)  

Venue：北海道大学農学部（札幌市）   Country：Japan  

Event date： 2010.9

Presentation type：Oral presentation (general)  

Venue：京都大学吉田キャンパス（京都市）   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：Rhega Royal Hotel Sakai, Osaka   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：北海道大学（札幌市）   Country：Japan  

Eguchi T. and Yoshida S. Environmental physiological studies on storage root formation in sweetpotatoes (4). Development of the root under hypoxic condition. Joint Meeting on Environmental Engineering in Agriculture 2006.

Presentation type：Oral presentation (general)  

Venue：九州沖縄農業研究センター久留米研究拠点（久留米市）   Country：Japan  

Eguchi T. and Yoshida S. Effects of sucrose and cytokinin application to roots on tuberous root formation of sweetpotato.

Event date： 2024.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北工業大学 八木山キャンパス   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：山口KDDI維新ホール   Country：Japan  

Event date： 2022.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto International Conference Center   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学（伊都キャンパス）   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学（オンライン開催）   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学（オンライン開催）   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：島根大学（オンライン開催）   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学（伊都キャンパス）   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学（伊都キャンパス）   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学（松戸キャンパス）   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学（松戸キャンパス）   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学（松戸キャンパス）   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：島根大学（松江キャンパス）   Country：Japan  

Event date： 2019.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学（西新プラザ）   Country：Japan  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農業大学（世田谷キャンパス）   Country：Japan  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農業大学（世田谷キャンパス）   Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農工大学農学部府中キャンパス（府中市））   Country：Japan  

Event date： 2017.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州学術研究都市・産学連携センター（北九州市）   Country：Japan  

Cultivation of the medicinal plant Pinellia ternata under the artificial light.
Toshihiko EGUCHI1, Hiroyuki TANAKA2, Satoshi YOSHIDA1, Ken MATSUOKA1
1Biotron Application Center, Kyushu Univ., 2Pharmaceutical Sciences, Kyushu Univ.

A high yeild strain of the medicinal plant Pinellia ternata was cultivated under the artificial light condition and the corm growth and quality were compared with the corms obtained from the plants grown under the natural light condition. Plants grown under the artificial light produced the similar corm yield with the similar quality to the plants grown under the natural light.

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学農学部（樽味キャンパス）   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：鹿児島大学農学部（鹿児島市）   Country：Japan  

Temperature effect on growth of the medicinal plant Pinellia ternata.
Toshihiko EGUCHI1, Hiroyuki TANAKA2, Satoshi YOSHIDA1, Ken MATSUOKA1
1Biotron Application Center, Kyushu Univ., 2Pharmaceutical Sciences, Kyushu Univ.

Temperature effects on the growth of the medicinal plant Pinellia ternata were examined under the air temperatures of 20, 25, and 30℃. The highest yield of the tuber was observed in Kyoto strain grown under 25℃, and the content of the effective ingredient was higher than that of the raw drag on the market.

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州沖縄農業研究センター合志拠点（合志市）   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州沖縄農業研究センター合志拠点（合志市）   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州沖縄農業研究センター合志拠点（合志市）   Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：佐賀大学（佐賀市）   Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：佐賀大学（佐賀市）   Country：Japan  

Event date： 2012.11

Presentation type：Oral presentation (general)  

Venue：長崎総合科学大学（長崎市）   Country：Japan  

K. Kinoshita, H. Yamamoto, T. Eguchi, K. Zushi, K. Nakazono, T. Yoshioka, A. Kubota, K. Matsuo, M. Kitano : Investigation of compatible solutes for feezing resistance in tea leaves.

Event date： 2011.9

Presentation type：Oral presentation (general)  

Venue：北海道大学農学部（札幌市）   Country：Japan  

Event date： 2009.11

Presentation type：Oral presentation (general)  

Venue：九州大学（福岡市）   Country：Japan  

T. Eguchi, T. Suzuki, J. Tateishi, J. Chikushi, S. Yoshida, I. Miyajima, and M. Kitano. Time course of carrot storage root growth in a subirrigation solid culture system.

Event date： 2009.9

Presentation type：Oral presentation (general)  

Venue：秋田大学（秋田市）   Country：Japan  

Eguchi, T., T. Suzuki, J. Tateishi, J. Chikushi, S. Yoshida., I. Miyajima, and M. Kitano Studies on Soil-less Culture of Carrot (2) Influence of Root Temperature on Yield and Quality of Storage Root. Annual meeting of Japanese Society for Horticultural Science 2009 (Autumn).

Event date： 2008.11

Presentation type：Oral presentation (general)  

Venue：九州大学（福岡市）   Country：Japan  

T. Eguchi, T. Suzuki, H. Miyamoto, S. Yoshida, J. Chikushi, and M. Kitano. Effects of soil temperature on growth and quality of carrot storage root during late growth stage.

Presentation type：Oral presentation (general)  

Venue：Metro Tronto Convention Centre (Tronto)   Country：Canada  

Presentation type：Oral presentation (general)  

Venue：Metro Tronto Convention Centre (Tronto)   Country：Canada  

Presentation type：Oral presentation (general)  

Venue：静岡大学（静岡市）   Country：Japan  

Eguchi T. and Yoshida S. Effects of sugars and plant hormone on tuberous root formation in sweetpotatoes. Annual meeting of Japanese Society for Horticultural Science 2004 (Autumn).

Presentation type：Oral presentation (general)  

Venue：福岡国際会議場（福岡市）   Country：Japan  

Eguchi T. and Yoshida S. Environmental physiological studies on storage root formation in sweetpotatoes (2). Effect of gas exchange interference on storage root formation. Joint Meeting on Environmental Engineering in Agriculture 2004.

Presentation type：Oral presentation (general)  

Venue：亀山亭（日田市）   Country：Japan  

Eguchi T. and Yoshida S. Methods of sweetpotato hydroponics for research of tuberous root formation.

Presentation type：Oral presentation (general)  

Venue：金沢大学（金沢市）   Country：Japan  

Eguchi T. and Yoshida S. Environmental physiological studies on storage root formation in sweetpotatoes (3). Lignification of the root under the conditions where the tuberous root never formed. Joint Meeting on Environmental Engineering in Agriculture 2005.

Presentation type：Oral presentation (general)  

Venue：本渡市市民センター（本渡市）   Country：Japan  

Eguchi T. Effect of root-zone O2 concentration on tuberous root formation in sweetpotato (Ipomoea batatas Lam.).

Presentation type：Oral presentation (general)  

Venue：長崎大学（長崎市）   Country：Japan  

Moriyama S, Hamakoga M, Tou K, Miyajima I, Chikushi J, Yoshida S and Eguchi T. Fundamental studies on hydroponics of a sweetpotato cultivar "Suioh" for utilization of the shoot (1) Differences in the yield and the quality between two different cultivation system. Annual meeting of Japanese Society for Horticultural Science 2006 (Autumn).

Presentation type：Oral presentation (general)  

Venue：沖縄県農業研究センター（沖縄県糸満市）   Country：Japan  

T. Eguchi. A trail of soilless cultivation of carrots.

Presentation type：Oral presentation (general)  

Venue：香川大学（高松市）   Country：Japan  

Eguchi, T., S. Moriyama, J. Tateishi, I. Miyajima, J. Chikushi and S. Yoshida. Studies on hydroponics for top production of sweetpotato cultivar ‘Suioh’ (2).Yields and quality under different conditions of nutrient solution concentration and light intensity. Annual meeting of Japanese Society for Horticultural Science 2007 (Autumn).

Presentation type：Oral presentation (general)  

Venue：三重大学（津市）   Country：Japan  

Eguchi, T., T. Suzuki, H. Miyamoto, M. Hamakoga, J. Chikushi, S. Yoshida., and M. Kitano Relationship between water content of root media and growth of storage root in carrot hydroponics. Annual meeting of Japanese Society for Horticultural Science 2008 (Autumn).

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Eguchi T., Yoshida S. and Saitou K. Regulation of sweetpotato tuberous root forming gene with environment control. Report of Research Project, Grant-in Aid for Scientific Research (C) (2), 2003-2004.

Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Type：Academic society, research group, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Type：Academic society, research group, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Number of peer-reviewed articles in Japanese journals：2

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：3

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Academic society, research group, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc.